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Definitions

• This invention relates to tropane derivatives useful in the treatment of a variety of disorders, including those in which the modulation of CCR5 receptors is implicated. More particularly, the present invention relates to 3-(3-isopropyl-5-methyl-4H-1,2,4-triazol-4-yl)-exo-8-azabicyclo[3.2.1] octane derivatives and to processes for the preparation of, intermediates used in the preparation of, compositions containing and the uses of, such derivatives.
• Disorders that may be treated or prevented by the present derivatives include HIV and genetically related retroviral infections (and the resulting acquired immune deficiency syndrome, AIDS), and inflammatory diseases.
• the compounds of the present invention are modulators, especially antagonists, of the activity of chemokine CCR5 receptors.
• Modulators of the CCR5 receptor may be useful in the treatment of various inflammatory diseases and conditions, and in the treatment of infection by HIV-1 and genetically related retroviruses.
• the name "chemokine” is a contraction of "chemo tactic cyto kines ".
• the chemokines comprise a large family of proteins which have in common important structural features and which have the ability to attract leukocytes. As leukocyte chemotactic factors, chemokines play an indispensable role in the attraction of leukocytes to various tissues of the body, a process which is essential for both inflammation and the body's response to infection.
• chemokines and their receptors are central to the pathophysiology of inflammatory and infectious diseases, agents which are active in modulating, preferably antagonizing, the activity of chemokines and their receptors, are useful in the therapeutic treatment of such inflammatory and infectious diseases.
• CCR5 The chemokine receptor CCR5 is of particular importance in the context of treating inflammatory and infectious diseases.
• CCR5 is a receptor for chemokines, especially for the macrophage inflammatory proteins (MIP) designated MIP-1 ⁇ and MIP-1 ⁇ , and for a protein which is regulated upon a ctivation and is n ormal T -cell e xpressed and s ecreted (RANTES).
• MIP macrophage inflammatory proteins
• RANTES n ormal T -cell e xpressed and s ecreted
• WO 98/25617 relates to substituted aryl piperazines as modulators of chemokine receptor activity.
• the present compounds are generally disclosed by WO 00/38680 but none is specifically exemplified therein.
• C 1-6 alkyl in the definition of R 1 includes straight-chain and branched groups. Examples of alkyl include methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec-butyl and t-butyl. "C 3-6 cycloalkyl” means cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
• the compounds of formula (I) contain a basic centre and suitable acid addition salts are formed from acids which form non-toxic salts.
• suitable acid addition salts are formed from acids which form non-toxic salts. Examples include the hydrochloride, hydrobromide, hydroiodide, sulphate, bisulphate, nitrate, phosphate, hydrogen phosphate, acetate, maleate, fumarate, lactate, tartrate, citrate, gluconate, camsylate, succinate, saccharate, benzoate, methanesulphonate, ethanesulphonate, benzenesulphonate, p -toluenesulphonate and pamoate salts.
• suitable salts see Berge et al, J. Pharm. Sci., 66, 1-19, 1977 .
• the pharmaceutically acceptable solvates of the compounds of the formula (I) or salts thereof include the hydrates thereof.
• a compound of the formula (I) contains one or more asymmetric carbon atoms and therefore exists in two or more stereoisomeric forms.
• the present invention includes the individual stereoisomers of the compounds of the formula (I) and, where appropriate, the individual tautomeric forms thereof, together with mixtures thereof.
• Separation of diastereoisomers may be achieved by conventional techniques, e.g. by fractional crystallisation, chromatography or H.P.L.C. of a stereoisomeric mixture of a compound of the formula (I) or a suitable salt or derivative thereof.
• An individual enantiomer of a compound of the formula (I) may also be prepared from a corresponding optically pure intermediate or by resolution, such as by H.P.L.C. of the corresponding racemate using a suitable chiral support or by fractional crystallisation of the diastereoisomeric salts formed by reaction of the corresponding racemate with a suitable optically active acid or base, as appropriate.
• the invention also includes isotopically labelled compounds of the formula (I).
• R 1 is either C 4-6 cycloalkyl optionally substituted by one or two fluorine atoms, or C 1-4 alkyl optionally substituted by from one to three fluorine atoms.
• R 1 is either cyclobutyl, cyclopentyl, 4,4-difluorocyclohexyl or 3,3,3-trifluoropropyl.
• R 2 is phenyl optionally substituted by 1 or 2 fluorine atom(s).
• R 2 is phenyl or monofluorophenyl.
• R 2 is phenyl or 3-fluorophenyl.
• Preferred compounds of the formula (I) include:
• the compounds of the formula (I) may be prepared by the following general methods in which R 1 and R 2 are as previously defined for a compound of the formula (I) unless otherwise stated.
• a ketone of the formula (XVIII) may be converted to a racemic amine of the formula (IIA) by reductive amination under conventional conditions using ammonia, or equivalent thereof, and a reducing agent in a suitable solvent.
• the amine of the formula (II) may be converted to a compound of the formula (I) by the routes described in Methods 1 and 2.
• a racemic amine of the formula (IIA) may be converted to a compound of the formula (I) using a compound of the formula (III), or a suitable activated derivative thereof, a chiral catalyst, optionally using a catalyst for racemization of the unwanted isomer present, and a suitable solvent.
• the amine of the formula (II), or a metal salt thereof (i.e. a deprotonated form), may also be converted to a compound of the formula (I) by reaction with an ester of the formula: R 1 CO 2 R 5 (XXIV) wherein R 5 is an ester-forming group such as C 1 -C 6 alkyl.
• the reaction may be carried out by reacting the ester and the amine, or metal salt thereof, with an excess of a base such as triethylamine and an optional catalyst in a solvent such as dichloromethane, ethyl acetate, THF or toluene, with or without water present as a co-solvent: or by reacting the ester and the amine in the presence of an enzyme-catalyst in a solvent such as dichloromethane, ethyl acetate, THF or toluene, with or without water present as a co-solvent.
• a base such as triethylamine and an optional catalyst
• a solvent such as dichloromethane, ethyl acetate, THF or toluene
• an enzyme-catalyst in a solvent such as dichloromethane, ethyl acetate, THF or toluene, with or without water present as a co-solvent.
• a pharmaceutically acceptable salt of a compound of the formula (I) may be readily prepared by mixing together solutions of a compound of the formula (I) and the desired acid.
• the salt may precipitate from solution and be collected by filtration or may be recovered by evaporation of the solvent.
• the compounds of formula (I), and their pharmaceutically acceptable salts are useful because they have pharmacological activity in animals, including humans. More particularly, they are useful in the treatment of a disorder in which the modulation of CCR5 receptors is implicated. Disease states that may be mentioned include HIV, a retroviral infection genetically related to HIV, AIDS, or an inflammatory disease.
• the compounds of formula (I), and their pharmaceutically acceptable salts may be administered alone or as part of a combination therapy.
• the compounds of this invention may be used for treatment of respiratory disorders, including adult respiratory distress syndrome (ARDS), bronchitis, chronic bronchitis, chronic obstructive pulmonary disease, cystic fibrosis, asthma, emphysema, rhinitis and chronic sinusitis.
• ARDS adult respiratory distress syndrome
• bronchitis chronic bronchitis
• chronic obstructive pulmonary disease cystic fibrosis
• asthma emphysema
• rhinitis chronic sinusitis
• Other conditions that may be treated are those triggered, affected or are in any other way correlated with T-cell trafficking in different organs.
• the compounds of this invention may be useful for the treatment of such conditions and in particular, but not limited to the following for which a correlation with CCR5 or CCR5 chemokines has been established: inflammatory bowel disease, including Crohn's disease and ulcerative colitis, multiple sclerosis, rheumatoid arthritis, graft rejection, in particular but not limited to kidney and lung allografts, endometriosis, type I diabetes, renal diseases, chronic pancreatitis, inflammatory lung conditions or chronic heart failure.
• chemokine receptor activity is demonstrated by methodology known in the art, such as by using the assay for CCR5 binding following procedures disclosed in Combadiere et al., J. Leukoc. Biol., 60, 147-52 (1996 ); and/or by using the intracellular calcium mobilisation assays as described by the same authors.
• Cell lines expressing the receptor of interest include those naturally expressing the receptor, such as PM-1, or IL-2 stimulated peripheral blood lymphocytes (PBL), or a cell engineered to express a recombinant receptor, such as CHO, 300.19, L1.2 or HEK-293.
• the compounds of the formula (I) can be administered alone but will generally be administered in admixture with a suitable pharmaceutical excipient, diluent or carrier selected with regard to the intended route of administration and standard pharmaceutical practice.
• the compounds of the formula (I) can be administered orally, buccally or sublingually in the form of tablets, capsules, multi-particulates, gels, films, ovules, elixirs, solutions or suspensions, which may contain flavouring or colouring agents, for immediate-, delayed-, modified-, sustained-, pulsed- or controlled-release applications.
• the compounds of the formula (I) may also be administered as fast-dispersing or fast-dissolving dosage forms or in the form of a high energy dispersion or as coated particles. Suitable formulations of the compounds of the formula (I) may be in coated or uncoated form, as desired.
• Such solid pharmaceutical compositions may contain excipients such as microcrystalline cellulose, lactose, sodium citrate, calcium carbonate, dibasic calcium phosphate, glycine and starch (preferably corn, potato or tapioca starch), disintegrants such as sodium starch glycollate, croscarmellose sodium and certain complex silicates, and granulation binders such as polyvinylpyrrolidone, hydroxypropylmethylcellulose (HPMC), hydroxypropylcellulose (HPC), sucrose, gelatin and acacia. Additionally, lubricating agents such as magnesium stearate, stearic acid, glyceryl behenate and talc may be included.
• excipients such as microcrystalline cellulose, lactose, sodium citrate, calcium carbonate, dibasic calcium phosphate, glycine and starch (preferably corn, potato or tapioca starch), disintegrants such as sodium starch glycollate, croscarmellose sodium and certain complex silicates, and
• a formulation of the tablet could typically contain from 0.01 mg to 500mg of active compound whilst tablet fill weights may range from 50mg to 1000mg.
• An example of a formulation for a 10mg tablet is illustrated below: Ingredient %w/w Compound of the formula (I) or salt 10.000* Lactose 64.125 Starch 21.375 Croscarmellose sodium 3.000 Magnesium stearate 1.500 * Quantity adjusted in accordance with drug activity.
• the tablets are manufactured by a standard process, for example, direct compression or a wet or dry granulation process.
• the tablet cores may be coated with appropriate overcoats.
• Solid compositions of a similar type may also be employed as fillers in gelatin or HPMC capsules.
• Preferred excipients in this regard include lactose, starch, a cellulose, milk sugar or high molecular weight polyethylene glycols.
• the compounds of the formula (I) may be combined with various sweetening or flavouring agents, colouring matter or dyes, with emulsifying and/or suspending agents and with diluents such as water, ethanol, propylene glycol and glycerin, and combinations thereof.
• the compounds of the formula (I) can also be administered parenterally, for example, intravenously, intra-arterially, intraperitoneally, intrathecally, intraventricularly, intraurethrally, intrasternally, intracranially, intramuscularly or subcutaneously, or they may be administered by infusion or needleless injection techniques.
• parenteral administration they are best used in the form of a sterile aqueous solution which may contain other substances, for example, enough salts or glucose to make the solution isotonic with blood.
• the aqueous solutions should be suitably buffered (preferably to a pH of from 3 to 9), if necessary.
• the preparation of suitable parenteral formulations under sterile conditions is readily accomplished by standard pharmaceutical techniques well-known to those skilled in the art.
• the daily dosage levels of compounds of formula (I), and their pharmaceutically acceptable salts will be from 0.01 to 30 mg/kg (in single or divided doses) and preferably will be in the range 0.01 to 15 mg/kg.
• tablets will contain 1 mg to 0.5g of compound for administration singly or two or more at a time, as appropriate.
• the physician in any event will determine the actual dosage which will be most suitable for any individual patient and it will vary with the age, weight and response of the particular patient.
• the above dosages are exemplary of the average case. There can, of course, be individual instances where higher or lower dosage ranges are merited and such are within the scope of this invention.
• Oral administration is preferred. Preferably, administration takes place shortly before an effect is required.
• the compounds of formula (I) can also be administered intranasally or by inhalation and are conveniently delivered in the form of a dry powder inhaler or an aerosol spray presentation from a pressurised container, pump, spray, atomiser or nebuliser, with or without the use of a suitable propellant, e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, a hydrofluoroalkane such as 1,1,1,2-tetrafluoroethane (HFA 134A [trade mark]) or 1,1,1,2,3,3,3-heptafluoropropane (HFA 227EA [trade mark]), carbon dioxide or other suitable gas.
• a suitable propellant e.g. dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, a hydrofluoroalkane such as 1,1,1,2-tetraflu
• the dosage unit may be determined by providing a valve to deliver a metered amount.
• the pressurised container, pump, spray, atomiser or nebuliser may contain a solution or suspension of the active compound, e.g. using a mixture of ethanol and the propellant as the solvent, which may additionally contain a lubricant, e.g. sorbitan trioleate.
• Capsules and cartridges (made, for example, from gelatin) for use in an inhaler or insufflator may be formulated to contain a powder mix of a compound of the formula (I) and a suitable powder base such as lactose or starch.
• the compounds may also be administered by the ocular route, particularly for treating inflammatory conditions or diseases of the eye.
• the compounds can be formulated as micronised suspensions in isotonic, pH adjusted, sterile saline, or, preferably, as solutions in isotonic, pH adjusted, sterile saline, optionally in combination with a preservative such as a benzylalkonium chloride.
• they may be formulated in an ointment such as petrolatum.
• the compounds of the formula (I) can be formulated as a suitable ointment containing the active compound suspended or dissolved in, for example, a mixture with one or more of the following: mineral oil, liquid petrolatum, white petrolatum, propylene glycol, polyoxyethylene polyoxypropylene compound, emulsifying wax and water.
• they can be formulated as a suitable lotion or cream, suspended or dissolved in, for example, a mixture of one or more of the following: mineral oil, sorbitan monostearate, a polyethylene glycol, liquid paraffin, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water.
• the compounds of the formula (I) may also be used in combination with a cyclodextrin.
• Cyclodextrins are known to form inclusion and non-inclusion complexes with drug molecules. Formation of a drug-cyclodextrin complex may modify the solubility, dissolution rate, bioavailability and/or stability property of a drug molecule. Drug-cyclodextrin complexes are generally useful for most dosage forms and administration routes.
• the cyclodextrin may be used as an auxiliary additive, e.g. as a carrier, diluent or solubiliser.
• Alpha-, beta-and gamma-cyclodextrins are most commonly used and suitable examples are described in WO-A-91/11172 , WO-A-94/02518 and WO-A-98/55148 .
• supplementary therapeutic agents used for the purpose of auxiliary treatment include drugs which, instead of directly treating or preventing a disease or condition mediated by or associated with CCR5 chemokine receptor modulation, treat diseases or conditions which directly result from or indirectly accompany the basic or underlying CCR5 chemokine receptor modulated disease or condition.
• the methods of treatment and pharmaceutical compositions of the present invention may employ the compounds of formula (I), and their pharmaceutically acceptable salts, in the form of monotherapy, but said methods and compositions may also be used in the form of multiple therapy in which one or more compounds of formula (I), or their pharmaceutically acceptable salts, are coadministered in combination with one or more known therapeutic agents such as those described in detail further herein.
• Preferred combinations of the present invention include simultaneous, or sequential treatments with a compound of formula (I), or a pharmaceutically acceptable salt thereof, and one or more inhibitors of HIV protease and/or inhibitors of HIV reverse transcriptase, preferably selected from the class of non-nucleoside reverse transcriptase inhibitors (NNRTI), including but not limited to nevirapine, delavirdine and efavirenz; from among the nucleoside/nucleotide inhibitors, including but not limited to zidovudine, didanosine, zalcitabine, stavudine, lamivudine, abacavir, adefovir and dipivoxil; and from among the protease inhibitors, including but not limited to indinavir, ritonavir, saquinavir, nelfinavir, lopinavir and amprenavir.
• NRTI non-nucleoside reverse transcriptase inhibitors
• agents useful in the above-described preferred embodiment combinations of the present invention include current and to-be-discovered investigational drugs from any of the above classes of inhibitors, including but not limited to FTC, PMPA, fozivudine tidoxil, talviraline, S-1153, MKC-442, MSC-204, MSH-372, DMP450, PNU-140690, ABT-378 and KNI-764.
• a compound of formula (I), or a pharmaceutically acceptable salt thereof together with a supplementary therapeutic agent used for the purpose of auxiliary treatment, wherein said supplementary therapeutic agent comprises one or more members independently selected from the group consisting of proliferation inhibitors, e.g.
• immunomodulators e.g. , sargramostim, and various forms of interferon or interferon derivatives
• fusion inhibitors e.g. , AMD3100, T-20, PRO-542, AD-349, BB-10010 and other chemokine receptor agonists/antagonists
• tachykinin receptor modulators e.g. NK1 antagonists
• integrase inhibitors e.g. , AR177
• RNaseH inhibitors inhibitors of viral transcription and RNA replication
• Preferred methods of treatment of the present invention for the prevention of HIV infection, or treatment of aviremic and asymptomatic subjects potentially or effectively infected with HIV include but are not limited to administration of a member independently selected from the group consisting of: ( i ) a compound within the scope of formula (I) as disclosed herein; ( ii ) one NNRTI in addition to a compound of ( i ); ( iii ) two NRTI in addition to a compound of ( i ); ( iv ) one NRTI in addition to the combination of ( ii ); and ( v ) a compound selected from the class of protease inhibitors used in place of a NRTI in combinations ( iii ) and ( iv ).
• the preferred methods of the present invention for therapy of HIV-infected individuals with detectable viremia or abnormally low CD4 counts further include as a member to be selected: ( vi ) treatment according to ( i ) above in addition to the standard recommended initial regimens for the therapy of established HIV infections, e.g. , see http://hivatis.org/trtgdlns.html.
• standard regimens include but are not limited to an agent from the class of protease inhibitors in combination with two NRTIs; and ( vii ) a standard recommended initial regimens for the therapy of established HIV infections, e.g.
• protease inhibitor component or one or both of the NRTIs is/are replaced by a compound within the scope of formula (I) as disclosed herein.
• the preferred methods of the present invention for therapy of HIV-infected individuals that have failed antiviral therapy further include as a member to be selected: ( viii ) treatment according to (i) above, in addition to the standard recommended regimens for the therapy of such patients, e.g. , see http://hivatis.org/trtgdlns.html; and ( ix ) a standard recommended initial regimens for the therapy of patients who have failed antiretroviral therapy, e.g. , see http://hivatis.org/trtgdlns.html, where either one of the protease inhibitor components, or one or both of the NRTIs is/are replaced by a compound within the scope of formula (I) as disclosed herein.
• N-Benzyl-N'-cyclohexylcarbodiimide-polymer bound (1.15g, 0.88mmol) was added to a solution of the title compound from Preparation 11 (250mg, 0.68mmol) and cyclobutanecarboxylic acid (130 ⁇ l, 1.37mmol) in dichloromethane (10ml) and the mixture stirred at room temperature for 16 hours. The mixture was filtered through Celite ® (filtration aid) and evaporated under reduced pressure.
• Cyclopentanecarboxylic acid (115 ⁇ l, 1.06mmol) was added to a solution of the title compound from Preparation 11 (300mg, 0.82mmol), hydroxybenzotriazole hydrate (10mg, 74 ⁇ mol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide methiodide (300mg, 1.07mmol) in dichloromethane (10ml) and the mixture stirred at room temperature for 3 hours. Saturated aqueous sodium carbonate solution (50ml) was added to the mixture and the product was extracted with dichloromethane (2x). The combined organic layers were washed with brine, dried (MgSO 4 ), filtered and evaporated under reduced pressure.
• N-Benzyl-N'-cyclohexylcarbodiimide-polymer bound (370mg, 0.336mmol) was added to a solution of the title compound from Preparation 11 (100mg, 0.27mmol) and 4,4,4-trifluorobutanecarboxylic acid (45mg, 0.32mmol) in dichloromethane (4ml) and the mixture was stirred at room temperature for 1.5 hours. The mixture was filtered through Celite ® and evaporated under reduced pressure.
• N-Benzyl-N'-cyclohexylcarbodiimide-polymer bound (500mg, 0.545mmol) was added to a solution of the title compound from Preparation 11 (100mg, 0.27mmol) and 4,4-difluorocyclohexanecarboxylic acid (50mg, 0.30mmol) in dichloromethane (4ml) and the mixture was stirred at room temperature for 1.5 hours. The mixture was filtered through Celite ® and evaporated under reduced pressure.
• the title compound was prepared from the title compound from Preparation 13 (200mg, 0.52 mmol) and 4,4,-difluorocyclohexanecarboxylic acid (128mg, 0.79 mmol) using a similar method to that described in Example 4, 160mg.
• the melting point of Form B was determined as 197 °C (peak temperature) using a T. A. Instruments 2100 DSC. The Scan was made at 20 °C/minute, (ambient to 300 °C) with nitrogen flow gas.
• the title compound from Preparation 9 was slurried in dichloromethane (9ml) and a solution of the title compound from Preparation 17 (1.58g, 5.35mmol) in toluene (3.2ml) was added to the reaction mixture followed by addition of acetic acid (0.3ml). To the resultant solution was added sodium triacetoxyborohydride (1.36g, 6.24mmol) in portions. The resultant slurry was strirred at room temperature for 30 minutes. A sample was analysed by HPLC and TLC and the reaction was deemed complete. Water (10ml) was added followed by 2M aqueous potassium hydroxide solution (10ml) and the layers were separated.
• Diisobutylaluminium hydride (1 M in dichloromethane, 60ml, 60mmol) was cooled to -78°C and added dropwise to a solution of the title compound from Preparation 2 (8.39g, 30mmol) in dichloromethane (150ml) at -78°C. The reaction was stirred for 90 minutes then methanol (pre-cooled to -78°C, 40ml) was added. The mixture was allowed to warm to room temperature and poured into 2M aqueous hydrochloric acid (200ml). The layers were separated and the aqueous phase extracted with dichloromethane (2x).
• reaction mixture was stirred at room temperature for 2 days after which time isobutyric acid (2.6ml, 28mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (5g, 26mmol) and triethylamine (3ml, 22.3mmol) were added.
• the reaction was stirred for 24 hours.
• Saturated aqueous sodium carbonate solution 300ml was added to the mixture and the product was extracted with dichloromethane (2x). The combined organic layers were washed with brine, dried (MgSO 4 ), filtered and evaporated under reduced pressure.
• the crude material was suspended in 6N aqueous hydrochloric acid (40ml) and heated under reflux for 12 hours after which time 12N aqueous hydrochloric acid (4ml) was added.
• the reaction mixture was heated under reflux for 2 hours.
• the mixture was evaporated under reduced pressure.
• the residue was basified by the addition of saturated aqueous potassium carbonate solution (200ml) and the product was extracted with dichloromethane (3x). The combined organic layers were washed with brine, dried (MgSO 4 ), filtered and evaporated under reduced pressure.
• Ammonium formate (6g, 92mmol) was added to a solution of the title compound from Preparation 8 (3.12g, 9.6mmol) and palladium (II) hydroxide (500mg) in ethanol (400ml). The mixture was heated under reflux for 2 hours after which time 0.88 ammonia solution (2ml) was added. The mixture was heated under reflux for 1 hour and the reaction was allowed to cool to room temperature and filtered through Arbocel TM (filtration aid).
• the aqueous layer was washed with dichloromethane (100ml).
• the combined organic layers were washed with water (100ml) and then with 1 M aqueous hydrochloric acid (100ml) followed by a wash with water (100ml).
• the organic layer was concentrated to a brown oil and the oil was granulated in ethyl acetate: heptane 1:2, by volume (50ml) for 4 hours.
• the white solid was filtered off and dried in an oven under reduced pressure for 12 hours at 40°C to yield the title compound as a white solid, 10.9g, 66% in yield.
• Sulphur trioxide pyridine complex (80.3g, 0.50mol) was slurried in dichloromethane (175ml) under an atmosphere of nitrogen. Dimethylsulfoxide (175ml) was added and the resultant solution was cooled to 0°C. A solution of the compound from Preparation 16, triethylamine (70ml, 0.50mol) and dimethylsulfoxide (88ml) in dichloromethane (88ml) was added slowly to the reaction mixture keeping the temperature below 10°C. The resultant yellow solution was stirred at 0°C for 2 hours until a TLC sample indicated that all starting material was consumed. Water (750ml) was added and a biphasic mixture was obtained.
• the aqueous layer was basified to pH 11-12 by addition of 10M aqueous sodium hydroxide and the layers were separated.
• the organic layer was washed with 1M aqueous sodium hydroxide (27ml) and with brine (27ml).
• the organic layer was concentrated under reduced pressure to yield a pale brown foam, 13.3g, 76%.
• Clean sodium metal (24.3g, 1.06mol) was added in pieces to toluene (300ml) at room temperature and the mixture was heated under reflux.
• a solution of the title compound from Preparation 5 (20.0g, 87mmol) in toluene (200ml) and pentanol (120ml) was added slowly over 15 minutes to the refluxing reaction. During this time gas evolution was observed.
• the resultant mixture was heated under reflux for 2 hours to ensure complete consumption of sodium. A thick white slurry had formed.
• the reaction was cooled to 80°C and iso -propyl alcohol (200ml) was added. The reaction was allowed to cool to room temperature and water (700ml) was added.
• the aqueous layer was adjusted to pH 9 with 10M aqueous sodium hydroxide solution (ca. 0.5l). The layers were separated and the aqueous layer was washed with dichloromethane (1l). The combined organic layers were evaporated under reduced pressure to give a 2-methyl-2-butanol concentrate (ca. 2.5l). Ethyl acetate (1.5l) and acetic acid (200ml) were added. The resultant solution was heated to 80°C for 30 minutes. The solution was cooled to room temperature overnight. The solution was cooled to 0°C and the mixture was basified to pH 12 with 2M aqueous sodium hydroxide solution (2l). The layers were separated and the aqueous layer was washed with ethyl acetate (1l).
• Examples 1-5 were tested in the assay for CCR5 binding following the procedures disclosed in Combadiere et al., J. Leukoc. Biol. 60, 147-52 (1996 ) (mentioned above). All of the tested compounds were found to have an IC 50 value of less than 10 nM.

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